Impact of acute moderate elevation in left ventricular afterload on diastolic transmitral flow efficiency: analysis by vortex formation time.

Impact of acute moderate elevation in left ventricular afterload on diastolic transmitral flow efficiency: analysis by vortex formation time.
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DOI:
10.1016/j.echo.2008.12.006
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发表时间:
2009-04
影响因子:
6.5
通讯作者:
Belohlavek, Marek
Belohlavek, Marek
中科院分区:
医学2区
文献类型:
--
作者:
Jiamsripong, Panupong;Calleja, Anna M.;Alharthi, Mohsen S.;Dzsinich, Mate;McMahon, Eileen M.;Heys, Jeffrey J.;Milano, Michele;Sengupta, Partho P.;Khandheria, Bijoy K.;Belohlavek, Marek

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Formation of a vortex alongside a diastolic jet signifies an efficient blood transport mechanism. Vortex formation time (VFT) is an index of optimal conditions for vortex formation. We hypothesized that left ventricular (LV) afterload impairs diastolic transmitral flow efficiency and, therefore, shifts the VFT value out of its optimal range. In 9 open-chest pigs, we elevated LV afterload by externally constricting the ascending aorta and increasing systolic blood pressure to 130% of baseline value for 3 minutes. Systolic LV function decreased, diastolic filling velocity increased only during the late (atrial) phase from 0.46 ± 0.06 to 0.63 ± 0.19 m/s (P = 0.0231), and end-diastolic LV volume and heart rate remained unchanged. VFT decreased from 4.09 ± 0.27 to 2.78 ± 1.03 (P = 0.0046). An acute, moderate elevation in LV afterload worsens conditions for diastolic vortex formation, suggesting impaired blood transport efficiency.
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